A couple of years ago, we have published a paper in a reputable IEEE conference in field A. Recently (two years later), a paper in field B solved the same problem with the exact same algorithm without mentioning our work (the problem is of value to both fields).
We have tried contacting the authors but they do not respond.
While I cannot know if they have seen our work or not, other works are already citing the new paper as the one that solved the problem (without mentioning us).
Is there anything we can do about this?